Injector



No. 606,766.v

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No. 606,766. Patented luly 5, |898.

W. R.- PARK.

INJECTO'R.

(Application filed May I6, 1898.) (Model.) 3 Sheets-Sheet 2.

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w. R. PARK.

INIEGTR.

` (Application filed May 16, 1898.) (Model.) .5 3 SheetS-Sheef 3` Patented July 5, |898.

WVVFIESEEE.: r] y' vss jector embodying my invention.

UNITED STATES PATENT Fries.

WILLIAM R. PARK, OF TAUNTON, MASSACHUSETTS, ASSIGNOR 'TO THE HANCOCK INSPIRATOR COMPANY, OF BOSTON, MASSACHUSETTS.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 606,766, dated July 5, 1898. Application ruta May 16, 1898. sentirte. 680,794. citada.)

To all whom it may concern:

Be it known that I, WILLIAM' R. PARK, a citizen of the United States of America, and a resident of Taunton, county of Bristol, and State of Massachusetts, have invented certain new and useful Improvements in Injectors, of rwhichthe'following is a specification.

This invention relates lto injectors of the double-tube class, wherein a lifting-ejector is employed to supply water to a forcing-injector, which in turn operates to force and feed the water supplied to it against counterpressure,'such as that of a steam-boiler, and is shown and described as applied rin particular to that form of double-tube injector wherein the several elementary parts are operated by a single lever or equivalent device.

In the drawings hereto annexed, Figure l is a vertical longitudinal section of an in- Fig. 2 is a section of the injector shown in Fig. l at the line 2 2, viewed from thelboilerend of the injector. Fig. 3 is a vertical longitudinal section of part of the injector at the line 3 3 of Fig. 2, viewed-from the right-hand side; and Fig. 4 is a cross-sectional view corresponding in location to the section of Fig. 2

- of an injector employing a positive mechanically-controlled intermediate overiiow-valve. Fig. 5 is a vertical longitudinal section at the line 5 5 of Fig. 4. v

The structureof v the body of the injector and the operation of the steam-inlet valves, the lifter and forcer tubes,and the inal overiow-valve are shown and described in detail` in United States Letters Patent No. 492,944, issued to me and Belvin T. Williston on March 7, 1898. Therefore for the most part matters of detailed-description will be omitted herefrom, except such as relate in particular to the improvements and inventions which differentiate the structure here shown from preexisting forms of double-tube inj ectors.

The steam-valve which ad mits steam from pipe S to the lifter and forcer successively is a double valve, the portion V opening iirst in response to the movement of the common valve-stem V3. and admitting steam to the lifter steam-tube L', which is provided with a reducing-valve R, operated by an external valve-wheel R. The lifter-steam from steamtube L entrains water from the water-supply pipe W into the lifter combining and delivery tube L2, which delivers the lifter-water to the lifter deliverychamber L3. In the lifter delivery-chamber L3 are located the contiguo'usly-associated ends of the forcer steam-tube F and the forcer combining-tube F2. The forcerdelivery-tube F3 emerges into the forcer delivery-chamber F4. The iinal ,overiiow-aperture O delivers the overflow in the usualmanner. The iinal overflow-valve O is operated by the movement of the lever H through link H2, bell-crank lever K2 K3, which is pivoted to the standard K at K', connecting-rod O3, and valve-stem O2, which passes through a valve-chest O4.

The forcer steam-valve V2 opens to admit steam to the forcer after the lifter steamvalve V has admitted steam to the lifter and started the water-supply, and by the continuous movement of lever H the final overflowvalve O is graduallyclosed, so that the counter-pressure valve P is forced open when the feed-jet from the forcer delivery-tube F3 is fully established.

The prompt and certain establishment of an unbroken feed-jet in and from the forcer depends on the thorough immersion of the water-ent'raining aperture of the forcer combining-tube. To the end that the forcer combining-tube should be supplied with Water, theinvention shown and described in Letters Patent No. 492,944 Vaforesaid was directed. The herein-described improvement still further insures the prompt and certain action of the injector and removes wholly the possibility of failure in operation through inexperience, lack of skill, or carelessness on the part of the operator.

A passage G, formed in the wing-casting M, Fig. 2, forms a path of communication between the lifter deliverychamber L3 and forcer delivery-chamber F4. This passage in the structure shown begins with an aperture G,which is situated in the inclosing wall of the li fter delivery-chamber L3 at a pointvabove the entraining end of the forcer combiningtube, so that water passing through the said aperture G thoroughly floods the forcer-tube. The passage Gr continues from aperture Gr IOO down to an aperture G2, Fig. 3,wherethrough it comiiinnieates with the forcer deliverychainber F1, Fig. 2. An automatic checkvalve adapted to close in response to pressure from the forcer dclivery-elianiber is placed in this passage. As shown, this valve G3 seats itself over aperture Gg and is held in operative position by a plug G", Figs. and 3. Froin aperture G2 the water from the lifter delivery-elianiber flows to the final overflowoutlet O.

The operation of the injector controlled by a single steady movement of the lever His as follows: The lifter-water first fills the lifter delivery-eliainber L3, floods the entrance of the forcer combining-tube F2, passes through the aperture G, and then, instead of taking a short cut to the final overflow-valve, fills the passage G and emerges in a stream from the aperture G2, from which it finds its way to the iinal overflow-outlet O. Then when the forcer-steam is admitted and goes to work the pressure in the forcer delivery-cliaiiibei tends to reverse the current of water ilowing through the passage G. lith an injector constructed so that the passage G constitutes only a direct short cut from the lifter deliverychamber to the iinal overllowaperture the reversal of pressures and current tends to disturb the immersion of the forcer coinbining-tube, except so far as checked by an intermediate valve, and the jet may break or fail to be established; but with a tortuous passage, such as the passage G, there isareserve supply of foreer-coinbining-tube-iiiiiiiersion water, and before the forcereombiningtube can by any accident be deprived of its surrounding water valve O closes the final overllow and the established jet performs its appointed work.

The employment of an intermediate overflow-reservoir passage serves to correct the errors of operation to which inspirators having a positive ineclianically-coiitrolled intermediate overflow-valve have been found liable. Valve connections such as shown in Figs. i and 5 have heretofore been employed in injectors of this general type, but with indifferent success. The employment of positive connections which force the intermediate overflow-valve to its seat at a rigidly-predetermined instant in the succession of operations controlled b v the hand-lever limits the performance of the injector to a relatively narrow range of conditions, an intermediate valve properly set for operation under one condition of steam-pressure being ill adapted to operation under another condition; but if the auxiliary reservoir of lifter-water is provided the positively-coiitrolled intermediate overflow-valve may be employed successfully with greater variation in conditions than it can sustain without such reservoir, for the presence of an emergency supply of water for iininersing the forcer combining tube removes the danger otherwise to be apprehended from ill-timed closure of the intermediate overflow-valve. Thus if; the valve G, Figs. l and 5, is positively controlled by connections liT l K5, corresponding to connections O2 O of the linal overflow-valve, the valve G3 may be set in proper adjustment for a low, even the lowest probable, operating pressure and yet not be unduly outol adjustment for higher pressures, for between the time when the valve G3 ought to close if in perfect adjustment and the time of its actual closure a short interval only elapses, which is insufficient to permit the auxiliary reservoir of water to be wholly emptied. The forcer-tubes thus can establish the jet under favorable conditions. rlhe passage G thus constitutes an emergency reservoir of water between the forcer combining-tube and the foi'cer delivery-chamber. This reservoir requires an appreciable time to be emptied by back pressure. During that time the forcer combiningtube is fully supplied with water and an insu red opportunity is afforded for establishing the jet. If this condition is fulfilled, the shape and course of the passage G may be varied without materially interfering with its function.

That I claim, and desire to obtain by Letters Patent, is as follows:

l. In a lifting and forcing double-tube injector, the combination of a lifter, a lifter delivery-eliainber, a forcer, a forcer deliverychamber, a iinal overflow from the forcer deliverychamber, an intermediate overllowpassage from the lifter delivery-cliainbei to the forcer delivery-chainber, the said passage provided with a reservoir-eliainber interiiiediate between the lifter delivery-cliaiiiber and the forcer delivei'y-cliainbcr, an intermediate overflow-valve controlling the said passage, the lifter delivery-chamber and intermediate overflow-passage constituting a conduit from the lifter delivery-tube to and past the entrainiiig end of the forcer combining-tube, through the passage and reservoir to the forcer delivery-cliainber, substantially as described.

2. In a lifting and forcing double-tube injector, the combination of a lifter, a lifter delivery-cliamber, a forcer, a forcer deliverychamber, a final overllow l'roin the forcer dclii/'ery-chainber, an intermediate overflowpassage from the lifter deliif'ery-cliamber to the forcer delivery-chainber, a valve controlling said passage, a reservoir in said passage between the said valve and the lifter delivery-cliamber, the forcer combining-tube being located in the lifter delivery-eliainber between the lifter delivery-tube and the entrance to the intermediate overflow-passage, substantially as described.

23. In a lifting and forcing double-tube injector, the combination of a lifter, a lifter delivery-cliainber, a forcer, a forcer deliverychamber, alinal overflow from the forcer delivery-eliainber, an intermediate overflowpassage having a reservoir therein, leading from a part of the lifter delivery-chamber IOC) ITO

A above the forcer combining-tube into the forcer delivery-chamber, and an. intermediate overflow-valve controlling the said passage, substantially as described.

4. In a lifting and forcing double-tube injector the combination of a lifter, a lifter delivery-chamber, a forcer, a forcer deliverychamber, a n'al overflow from the forcer delivery-chamber, an intermediate overflowpassage, having a reservoir therein, leading from a part of the lifter delivery-chamber above the forcer combining-tube into the forcer delivery-chamber,and an intermediate automatic check-valve controlling said passage, adapted to close in response to pressure from the forcer delivery-chamber, substantially as described.

5. In a lifting and forcing double-tube injector, the combination of a lifter, a lifter delivery-chamber, a forcer delivery-chamber, a inal overiiow from the forcer deliverychamber, an intermediate overflow-passage, having a reservoir therein, leading from a part of the lifter delivery-chamber above the forcer combining-tube to a point in the forcer delivery-chamber below the forcer deliverytube, and an intermediate overflow-valve controlling the said passage, substantially as described.

Signed by me at Boston this 29th day of April, 1898.

- W'ILLIAM R. PARK.

Witnesses:

' ODIN B. ROBERTS, JOSEPH WARREN. 

